if a+b=4 and ab=3 find1/b2+1/a2
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36
a+b=4
ab=3
1/b²+1/a²
=a²+b²/a²b²
=(a+b)²-2ab/(ab)²
=4²-2*3/3²
=16-6/9
=10/9
killer96:
(a+b)²-2ab /(ab)² please explain how did -2ab came?
(a+b)² is a²+b²+2ab
we need only a²+b²
so k subracted 2ab from a²+b²+2ab
is it clear now
ya bro i see but while solving you put -2ab but answer is right
to cancel the 2ab we need to put -2ab only right
in the identity it is 2ab
ok it is clear now thank you
Answered by
7
Step-by-step explanation:
answer is 10/3 =1 1/9
see the pic for steps
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